A "dual mass flywheel" is a two piece spring loaded flywheel designed to absorb the torsional vibration created by the diesel. It actually is very good for the transmission and drive train components. It is there to take up the stress and spikes that the diesel creates. The problem lies with its ability to handle any increase in torque... it will not!!
Valeo, another clutch and drivetrain manufacture actually came up with this designed flywheel in 1987 with the 6. 9 and 7. 3 ford diesels. It really was not a bad thing except for the expense to replace it when came time. The fords never really exhibited much transmission problems much do to the flywheel. If they did incur problems it was mainly do to injector problems or over loading (GVW). Luk made a solid flywheel conversion for the fords using a spitting image clutch that the dodge diesels already have. Luk has the OE on the dodge diesels. Here is the kicker... Luk is now the OE for dodge, ford and chevy duramax diesels. So, what did they do? They made their own dual mass flywheel for all three trucks. It is falling apart in the fords so they had to hurry up and make a solid flywheel but the clutch disc they designed is getting ripped apart. The dual mass flywheel they designed for the duramax is not lasting 30,000 miles. I talked to a gentleman today that was on his 4th one in 40 thousand miles. On top of all this... the pressure plates in every one of these trucks as well as the new dodge is self adjusting. This stops the after market from being able to modify it and make it capable of more clamp force. Little do they know, we figured out a way to do it. Because I know they read these forms I cannot disclose what we do. Now we have to just get the configurations and make a solid flywheel replacement. That is, unless they beat us to it. Hint Hint. LOL
Peter
Attention: TDR Forum Junkies 
